基于DOA的相干算法研究与应用

Research and Implementation of cohere algorithm based on DOA

波达方向估计(Direction of Arrival estimate)是一种阵列信号处理技术,这种技术普遍应用于雷达和移动通信系统中用来确定信号的到达方向.和其他方法相比,这种方法具有高的角度分辨能力.把DOA引入到地震数据的相干体算法中,通过频率域的聚焦,可以将频率域原本分散的相位聚焦到同一个频率上.对聚焦后的振幅和相位进行多项式拟合,可以得到反映振幅和相位空间变化的地震属性.这些属性具有明确的物理意义,可以应用这些属性识别小尺度断层,检测地质体的轮廓.对实际资料的计算结果表明本方法具有很大的应用前景.

Direction of arrival estimation is a technique of array signal processing, which is widely used in the radar and mobile communication systems to find the direction of the signal. Comparing with other methods, this method has high resolution in angular. Introducing this method into seismic data coherence algorithm, with the help of focusing in the frequency domain we can focus the phase on a given frequency. Polynomial fitting the focused amplitude and phase, we can obtain some attributes that reveal lateral amplitude and phase changes. These attributes have certain physical significance, and can be used to distinguish small faults and geologic features. Real data processing shows this method is effective.